Suggested edits (suggestion mode)

Feature request: Suggested edits (suggestion mode) Summary Add a "suggestion mode" for document editing, similar to Google Docs' suggesting mode. When enabled, a user's changes are recorded as suggestions that the document owner or collaborators can accept or reject individually, rather than being applied directly to the document. Motivation Outline already excels at real-time multiplayer editing and has a solid commenting system for discussing content. But there's a gap in the review workflow: when someone wants to propose changes to a document they don't own, their only options are to either edit it directly (which may not be appropriate) or describe the changes in a comment (which is imprecise and creates extra work for the document owner). Suggested edits would fill this gap by letting collaborators propose precise inline changes — additions, deletions, and replacements — that the document owner can review and accept or reject with a si…